Dropping a Bomb in the Toilet

I think my Land Lady is on to me. She is reluctant to clean around me. The things she is responsible for  are going undone. Sure we take out the trash and clean up after ourselves but she hasn't been around in a while. The other day I go out to a movie and I come home while she is in the middle of cleaning the bathroom.
I walk past the bathroom and she sees me. She pulls out a box of toilet cleaner. You know the stuff you put in the back of the bowl that makes the water blue. She asks me if it's alright to use it. I tell her yeah.
Later that night she comes into the house with rubber dish washing gloves on. The gloves go to the elbow. In her hands are pair of tongs. In the grip of the tongs' jaws is a round blue toilet cleaner pellet. She is treating it like it's a piece of plutonium. Everyone is looking at her as she slowly maneuvers towards the bathroom. I think she believes its a bomb of some sort. She goes into the bathroom. After several minutes she comes out and tells us not to use the bathroom for ten minutes.
We looked around at each other.
"I bet she put that in the toilet instead of the back" One of my roommates said.
He said what I was thinking. I walked to the bathroom hoping against hope she put it in the back...wishing she didn't because it would make for a hilarious blog. I open the toilet and it's clear. I guess she read the instructions and someone how mixed it with the directions for the bomb she is making????